package com.yupi.springbootinit.utils;

import cn.hutool.core.collection.CollUtil;
import com.alibaba.excel.EasyExcel;
import com.alibaba.excel.support.ExcelTypeEnum;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang3.ObjectUtils;
import org.apache.commons.lang3.StringUtils;
import org.springframework.util.ResourceUtils;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

/**
 * Created with IntelliJ IDEA.
 *
 * @Author: hxu
 * @Date: 2024/05/28/15:46
 * @Description:
 */
@Slf4j
public class ExcelUtils {
    public static String excelToCsv(MultipartFile multipartFile){
//        File file = null;
//        try {
//            file = ResourceUtils.getFile("classpath:网站数据.xlsx");
//        } catch (FileNotFoundException e) {
//            throw new RuntimeException(e);
//        }
        List<Map<Integer, String>> list = null;
        try {
            list = EasyExcel.read(multipartFile.getInputStream())
                    .excelType(ExcelTypeEnum.XLSX)
                    .sheet()
                    .headRowNumber(0)
                    .doReadSync();
        } catch (IOException e) {
            log.info("表格处理错误！");
            throw new RuntimeException(e);
        }
        if (CollUtil.isEmpty(list)){
            return "";
        }else {
            //转为csv
            StringBuilder stringBuilder = new StringBuilder();
            //读取表头
            LinkedHashMap<Integer, String> headerMap = (LinkedHashMap)list.get(0);
            List<String> headerList = headerMap.values().stream().filter(ObjectUtils::isNotEmpty).collect(Collectors.toList());
            stringBuilder.append(StringUtils.join(headerList,",")).append("\n");
            for (int i= 1;i<list.size();i++){
                LinkedHashMap<Integer, String> dataMap = (LinkedHashMap)list.get(i);
                List<String> dataList = dataMap.values().stream().filter(ObjectUtils::isNotEmpty).collect(Collectors.toList());
                stringBuilder.append(StringUtils.join(dataList,",")).append("\n");
            }
            //读取数据
            return stringBuilder.toString();
        }
    }


    public static void main(String[] args) {
        excelToCsv(null);
    }
}
